Telephone apparatus and circuit therefor,申请号US19390285641-传众专利搜索

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发明名称	Telephone apparatus and circuit therefor
摘要
申请公布号	US2283646(A)	申请公布日期	1942.05.19
申请号	US19390285641	申请日期	1939.07.21
申请人	EDNA LEVI;ANNA T. GADE	发明人	NICHOLAS HAROLD I.
分类号	H04M19/02	主分类号	H04M19/02
代理机构		代理人
主权项
地址

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